A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
I have solved it, and it was related to my authentication credentials as I had suspected.
The issue was when my personal Office365 subscription renewed (Micosoft Account credentials) it somehow deleted my Enterprise Account within Office. The fix was to re-add my Enterprise Account to Office as per the following steps:
- Open MS Word
- Select "File" from the Ribbon
- Select "Account" from the left hand menu
- Select "Switch Accounts"
- Select "Add Account"
- Enter the User ID and Password for my Enterprise Account (SharePoint Online) and select the "Sign In" button.
Once this was done, the Service connections to the sharepoint site were all re-connected and I dont have any issue opening office documents on the sharepoint site anymore.